Not to mention that Russia is technically closer to the fake country they've created not so long ago called Azerbaijan not Armenia.
The thesis about fake states was recently invented by Putin in order to ultimately justify the military invasion and seizure of the territory of these states. So, a few months before Putin sent his troops to Ukraine, he declared that Ukraine was an artificially created state that Lenin created after the 1917 revolution.
I have never researched history of Ukraine so I'm gonna take your word for it but you obviously don't have any information about Azerbaijan history. It is indeed a fake country created by Soviets during wars between Iran and Soviet Union where they annexed part of Iran and called it the fake country of Azerbaijan.
If I want to put it in terms you understand, Azerbaijan to Iran is like the parts that Russia annexed between 2014 and 2022 (from Crimean to Donetsk, Donbas, Kharkiv, Kherson, ...). If they declare independence and name themselves a country (Donetsk republic?) that makes them a fake country.
The formation of Azerbaijan as a state took place a very long time ago, and in any case, it was before any actions by the Soviet Union.
The history of the formation of the statehood of Azerbaijan dates back to the III millennium BC. In the III century AD. Azerbaijan was occupied by the Iranian Sassanid Empire, and in the 7th century by the Arab Caliphate. The invaders resettled into the country a large population of Iranian and Arab origin. In the 15th - early 16th centuries, the outstanding statesman Shah Ismail Khatai (1501-1524) managed to unite all the northern and southern lands of Azerbaijan under his rule. A single centralized Azerbaijani state arose - the state of the Safavids with its capital in Tabriz. The Azerbaijani language, along with Persian, became the state language on the territory of a vast empire. As a result of successful reforms, domestic and foreign policy carried out by Shah Ismail, Shah Tahmasib, Shah Abbas and other Safavid sovereigns, the Safavid state turned into one of the most powerful empires in the Near and Middle East. However, after the death of the Azerbaijani commander Nadir Shah (1736-1747), the vast empire he ruled collapsed. And in the second half of the 18th century, Azerbaijan split into small states - khanates and sultanates.
At the end of the 18th century, the Azerbaijani Turkic Qajar dynasty (1796-1925) came to power in Iran. The Qajars began to pursue a policy aimed at subordinating to the central authority all the territories that were once under the rule of their ancestors Karakoyunlu, Akkoyunlu, Safavids and, finally, Nadir Shah, including the Azerbaijani khanates. Thus began the era of long-term wars between the Qajars and the Russian Empire, which was striving to seize the South Caucasus.
Thus, Azerbaijan turned into an arena of bloody wars between two great powers.
According to the Gulistan (1813) and Turkmenchay (1828) treaties, Azerbaijan was divided between two empires: Northern Azerbaijan was annexed to Russia, and Southern to Iran.
Thus, in the subsequent history of Azerbaijan, new concepts appeared: "Northern (or Russian) Azerbaijan" and "Southern (or Iranian) Azerbaijan".
In order to create a support and a Christian stronghold in the South Caucasus, Russia began to massively resettle the Armenian population from neighboring regions to the occupied Azerbaijani lands, in particular, the mountainous regions of Karabakh, the territories of the Erivan and Nakhichevan khanates. General Pashkevich even gave specific instructions on exactly where they should be relocated. In March 1828, the Iravan and Nakhichevan khanates of Azerbaijan were liquidated, and the so-called “Armenian region” was created on their territory for the resettled Armenians. Thus, the foundation of the future Armenian state on the lands of Azerbaijan was laid.
Here we can already see the current history of the conflict between Armenia and Azerbaijan over Nagorno-Karabakh and, as always, the negative role of Russia in this. And Azerbaijan is definitely not a fake or artificially created state.